I got some scrap cuts of black anodized aluminum extrusion out yesterday and played with some stuff. Working with anodized is fun!
This is on my 3 year old standard K40, it has analog potentiometer knob with mA meter.
First I did some lines to figure out what power level and speeds would mark the material (as it turns out, the vast majority of them do!)
5mA and a high speed like 400mm/s resulted in a somewhat faded start of the line, but things look good at 7-8mA and are solid at 10mA.
Now to engrave some logos:
The bottom left in this first one was scan + fill. I think it looks bad. The rest are just scan and look nicer.
Next picture. The middle row is 200, 300, 254 dpi. All programmed 400mm/s and 20% in LightBurn of “the pot is set really high", resulting in a real world max output of 5mA. Overscan is on: 3%
Even though I had 400mm/s set in LightBurn, I think the stock acceleration settings were not permitting it to actually get to the programmed speeds.
I tried again with acceleration set to 9000. You don’t have to modify the config file to play with that, you can use
M204 S5000 in LightBurn Console to set the acceleration to 5000. Note that your jogging and seeking is going to get really jerky as a result of this, but the rastering went well for me. If you get to that point you can go into config, increase your motor currents, set the acceleration to 3000 or 5000, and decrease the seek rate to 12,000 or 18,000.
Following are my notes from doing this, so won’t sound as nicely written:
20%, 30%, 10% in LB of former pot set high. All 400mm/s with overscan. Accel 9000. Jerky jogging but smooth raster. Need to lower seek rate now.
I think lower power and slowing down may be the way here.
Middle row was (dpi, % power in LB)
Last one looks nice.
That’s in the 4 not quite 5mA range.
Previous notes support findings.
It would be 5mA if it had time to saturate.
I think my middle row, last one on the right, was my nicest result so far.
Btw I did this with the new Smoothie firmware update that we’re releasing shortly that will allow for that level of raster engraving speed.